Detachable drill-bit.



DAVID A. GARDEN, 0F HOUSTON, TEXAS.

DETACHABLE DRILL-BIT.

Specification of Letters Patent.

Patented Apr. 1W i917.

Application filed March 23, 1916. Serial No. 86,147.

To all 'whom z't may concern.

Be it known that I, DAVID A. GARDEN, a citizen of the United States, residing at Houston, in the county of Harris and State of Texas, have invented certain new and usefullmprovements in Detachable-DrilLBits, of which the following is a specification.

This invention relates to new and useful improvements in a detachable drill bit.

The object of the invention is to provide a drill bit of the character described which may be readily attached to and detached.

' 'from the lower end of the drill stem. At the present time in drilling deep wells by the rotary process, a drill bit is attached to the lower end of the drill stem, or drill pipe, and said stein is then rotated by a rota-ry machine. When the bit becomes worn and dull the entire stem must be withdrawn in order to detach the bit and replace a new one. This operation requires considerable labor and consumes much time and the object of the present invention is to provide a bit which can be detached from and replaced on the lower end of the stem in the bore without withdrawing said stem.

With the above and other objects in View the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein:

I Figure 1 is a vertical sectional view of the bit attached tb the lower end of the drill stem,

Fig. 2 is a transverse sectional-view of the bit taken on yfthe line 2 2 of Fig. 1,

Fig. 3'is *t vertical sectional View of the fishing toolI 4fior,withdrawing the bit,

Fig. 4 isla transverse sectional view theref of taken on the line 4 4 of Fig. l, and

Fig. 5 is a plan view of the link employed.

Referring now more particularly to the drawings wherein like numerals of reference designate similar parts, in each of the figures the numeral l refers to a drill stein or pipe l having the collar 2 threaded onto the lower 6 eut therethrough in which is pivoted a relaend thereof and forming an extension of said stem. Fitted within the lower end of the stem is a cylindrical block 3, whose lower end has an internally threaded socket to r'eceive the externally threaded shank 4 of the drill bit 5. This block has a transverse slot tively thick reamer plate 7. This reamer is pivoted in the block by means of alpin 8 extending through said block and reamer at an eccentric point. The reamer, when the bit is in operation, extends in a transverse position relative to the block and is equal in length to the length of the slot -6 and is so pivoted that it may be swung around, as hereinafter explained, into a lengthwise position relative to the block 3 and when in said position will fit snugly within the slot 6, the width of said reamer being the same as the thickness of the block. The lower end of the collar 2 has oppositely arranged notches 9, 9, into which the corresponding ends of the reamer 7 it when the drill is in position to operate, thus preventing the relative rotation of the stem and bit.

A sucker rod 10 is provided, which passes down through the block 3, the upper end of the block being hollowed out for this pur-` pose, and pivoted to the lower end of said rod at their upper ends are the links 11, 11, whose lower ends are pivoted to the reamer 7 on each side, at a point diametrically opposite the pin 8. When it is desired to detach the bit from the stem, said stem is lirst elevated a short distance and an upward pull is then exert-ed, by a. fishing tool hereinafter described, on the rod 10. which causes the reamer 7 to swing around on the pin S and rest within the slot 6 and a further pull on said rod will elevate said rod and bit and withdraw them from the stem. When it is desired to release the bit, the same -may be lowered until the bit 5 rests upon the bottom of the bore and the weight of the sucker rod will cause thereainer to assume a transverse position. The stem may then be lowered until it rests upon said reamer and slowly turned until the notches 9, 9, are in position above the respective ends of the reamer and the stem will then suddenly drop into the position shown in ig. 1.

For the purpose of admitting water to the .wifn

point of the bit to carry away the cuttings,

the water passageways 12, 12, extend down through the block 3 from its upper end and continue through the bit 5 terminating on opposite sides of the bit and the water m5 lforced d own through the drill stem will thus be permitted to reach the point of the bit and will carry` the cuttings from said bit up through the bore on the outside of the stem tothe surface.

vhs

The upper end of the sucker rod has a conical shaped head 13 and spaced under rcath the same -is a collar lll.

F or the purpose of withdrawing the bit ll have provided a fishing tool, shown in Figs. 3 and 4;, which will now be described rlhe numeral l5 refers to a pipe section, threaded into the upper end of which is the block 1G, which carries an eye 17, to wl'ich a cable may be attached for suspending said tool into and withdrawing it from the stein. Secured in the lower end of the pipe section l5 is a seat 18 having a central opening,` 1.9 therethrough, the upper and lower ends of which are gradually enlarged 'forming inclined faces. Above this seat and secured to opposite sides-olA the section l5 are the oblong vertical bearings 20, Q0, in which operate the links 2l, 2l.

lfilhen it is desired to lower the bit in the well, the hshing tool is engaged to the upper end of the sucker rod l0, as shown in Fig. 3, the lower ends of the links 2l, 2l., engaging underneath the head 13. The bit and iishin tool. sustainiz the saine are thus lowe i. into the stein oy means of a cable (not shown) attached to the eye l?. lflfhen the bit has reached the bot' i or bore the lower ends of linlrs will contact against the upper tace oil`- the collar M, which is convex and will be by it forced apart into the corresponding recesses 22, :22, in `the upper side oi" the scat 3.8 and will, by said recesses, be held against engaging underthe head 123 when the ishing tool is withdrawn. W hen it is desired to withdraw the bi the pins 23, 253 are inserted through the :fnre'sponding orifices so that their inner ends will project into the correspond ing; recesses 22, The fishing;` tool is then lowered. and passes down over the head 13, which, on account ot' its conical rape, forces the lower' ends of the linlas Ll, 2l apart, buiJ when sflid head is passed above the lower ends of lthe links, said links will engage under said head, being prevented from seating in the recesses 22, 29, by said pins and when the fishing tool is elevated the bit will be withdrawn in the manner hereinl'iefore explained.

W hat claim is:

l. A device of the character described ineluding a supportingl block, a bit secured thereto, a member pivoted to the block and whose lends project out laterally and seat in mit?,

corresponding notches in the lower end of the drill stem.

2. A device of the character described including a supporting block adapted to be inserted in a drill stem, a drill bit secured thereto, a member pivoted to the block whose ends project out laterally beyond said block and seat in alined notches in the lower end of the drill stein.

3. In a device of the character described the combination with a drill stem having oppositely arranged notches in its lower end, oi' a supporting block having a transverse slot therethrough, a member pivoted to said block and operating in said slot, the ends of said ineinber normally projecting laterally beyond the block and resting in said notches, means whereby 'said nieinber may be rotated on its pivotal support and thereby withdrawn within said slot.

4. In a device or theV character described, the combination with a drill stem having oppositely arranged notches in its lower ond, ot' a supporting block adapted to be inserted within said stein and having a slotI therethrough, a drill bit carried by said supporting block, a member extending transversely through said slot and pivoted eccentrically therein, the ends et saidnieniber projecting beyond said block and being re-V ceived by said notches and means attached, to said member whereby it may be rotated on its pivotal support.

5. A device ot the character described in' cluding a drill stein having oppositelv arranged notches in its lower end, a support ing block having a transverse slot therethrough, a bit carried by said block, 'a meinber normally extending transversely through said slot and whose ends project laterally -beyond the block when in 'said transverse position and are received by said notches, said nav-1h91' being pivoted eccentrically in said means attached to said member wheres.y it may be rotated on its pivotal supportJ and a fishing tool arranged to engage with said .means to withdraw said device through said drill stem.

In testimony whereof l have signed my nane 'to this specification in the presence of two subscribing witnesses.

DAVE) A. GARDEN.

irVitnesses:

ANNE L. CARY, Cil-ras. W. JOHNSON; 

